/* ============================================================
   云开赛场 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body { margin: 0; }

img,
svg,
video,
picture { display: block; max-width: 100%; }

img { height: auto; }

h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

ul, ol { padding: 0; list-style: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

table { border-collapse: collapse; }

a { color: inherit; }

/* ---------- 变量 ---------- */
:root {
  /* 色彩 */
  --sea-900: #061A2B;
  --sea-700: #0C2B44;
  --sea-500: #14405F;
  --foam: #F2F6F8;
  --lava-500: #FF6A2B;
  --lava-300: #FF9A63;
  --tide-400: #2FD3C0;
  --palm-500: #3FBF7F;
  --amber: #FFC94A;
  --mist-400: #8FA3B2;
  --glass: rgba(242, 246, 248, 0.08);
  --glass-line: rgba(242, 246, 248, 0.16);
  --hairline: rgba(143, 163, 178, 0.22);

  /* 字体 */
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-display: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-num: 'JetBrains Mono', 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-serif: 'Noto Serif SC', 'Songti SC', 'STSong', Georgia, serif;

  /* 结构 */
  --max: 1440px;
  --pad: clamp(20px, 5vw, 64px);
  --gutter: 24px;
  --header-h: 88px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 基础排版 ---------- */
body {
  background-color: var(--sea-900);
  color: var(--foam);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 5vw, 56px); }
h2 { font-size: clamp(26px, 3.2vw, 38px); }
h3 { font-size: clamp(20px, 2vw, 24px); }
h4 { font-size: 18px; line-height: 1.3; }

p { max-width: 68ch; }

strong, b { font-weight: 700; }

::selection {
  background-color: var(--lava-500);
  color: var(--sea-900);
}

:focus-visible {
  outline: 2px solid var(--lava-300);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- 通用工具 ---------- */
.num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: 0;
}

.muted { color: var(--mist-400); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--tide-400);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  flex: none;
  background: linear-gradient(90deg, var(--tide-400), var(--palm-500));
  transform: skewY(-12deg);
}

.diagonal-mark {
  display: block;
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg, var(--tide-400), var(--palm-500));
  transform: skewY(-12deg);
}

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.page-main { padding-top: var(--header-h); }

.section { padding-block: 48px; }

.stack {
  display: flex;
  flex-direction: column;
  gap: 64px;
}

.grid {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 768px) {
  .section { padding-block: 80px; }
  .stack { gap: 88px; }
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1200px) {
  .section { padding-block: 112px; }
  .stack { gap: 112px; }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease),
              border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.btn--primary {
  background-color: var(--lava-500);
  color: var(--sea-900);
  border-color: var(--lava-500);
}

.btn--primary:hover {
  background-color: var(--lava-300);
  border-color: var(--lava-300);
}

.btn--primary:active { transform: translateY(1px); }

.btn--ghost {
  background-color: transparent;
  color: var(--foam);
  border-color: var(--glass-line);
}

.btn--ghost:hover {
  background-color: var(--glass);
  border-color: var(--tide-400);
  color: var(--foam);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  font-size: 14px;
  color: var(--mist-400);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(143, 163, 178, 0.45);
}

.breadcrumb a {
  color: var(--mist-400);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.breadcrumb a:hover { color: var(--foam); }

.breadcrumb [aria-current="page"] { color: var(--foam); }

/* ---------- 画板 ---------- */
.panel {
  position: relative;
  background-color: var(--sea-700);
  border: 1px solid var(--glass-line);
  padding: 26px;
}

.panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 14px;
  height: 14px;
  background-color: var(--sea-900);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  pointer-events: none;
}

.panel__head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  padding-bottom: 18px;
  margin-bottom: 24px;
}

.panel__head::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--tide-400), rgba(47, 211, 192, 0) 72%);
  transform: skewY(-0.6deg);
}

.panel__title { font-size: clamp(22px, 2.6vw, 32px); }

@media (min-width: 768px) {
  .panel { padding: 32px 36px; }
  .panel::before { width: 16px; height: 16px; }
}

/* ---------- 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--glass-line);
  aspect-ratio: 16 / 9;
  background-color: var(--sea-700);
  background-image:
    radial-gradient(120% 85% at 18% 0%, rgba(47, 211, 192, 0.16), transparent 62%),
    radial-gradient(90% 70% at 100% 100%, rgba(255, 106, 43, 0.14), transparent 60%),
    linear-gradient(160deg, var(--sea-500), var(--sea-900));
}

.media > img,
.media > picture,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--portrait { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 20px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--foam);
  background: linear-gradient(180deg, rgba(6, 26, 43, 0), rgba(6, 26, 43, 0.88));
}

.media__glass {
  position: absolute;
  right: 16px;
  bottom: 16px;
  left: 16px;
  padding: 14px 16px;
  background-color: var(--glass);
  border: 1px solid var(--glass-line);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: 16px;
  z-index: 300;
  padding: 10px 18px;
  background-color: var(--foam);
  color: var(--sea-900);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 2px;
  transition: top 0.2s var(--ease);
}

.skip-link:focus { top: 12px; }

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  background-color: transparent;
  transition: background-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background-color: var(--glass-line);
  opacity: 0;
  transition: opacity 0.32s var(--ease);
}

.site-header[data-stuck] {
  background-color: var(--sea-900);
  box-shadow: 0 14px 34px rgba(2, 10, 20, 0.55);
}

.site-header[data-stuck]::after { opacity: 1; }

.site-header[data-open="true"] {
  background-color: var(--sea-900);
  box-shadow: 0 14px 34px rgba(2, 10, 20, 0.55);
}

.site-header__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 24px;
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
  min-height: 88px;
  transition: min-height 0.32s var(--ease);
}

.site-header[data-stuck] .site-header__inner { min-height: 64px; }

/* 品牌标识 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
  color: var(--foam);
  text-decoration: none;
}

.brand__mark {
  position: relative;
  display: block;
  flex: none;
  width: 28px;
  height: 22px;
}

.brand__mark::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 11px;
  height: 22px;
  background: linear-gradient(160deg, var(--lava-300), var(--lava-500));
  clip-path: polygon(0 0, 100% 16%, 100% 84%, 0 100%);
}

.brand__mark i {
  position: absolute;
  left: 16px;
  display: block;
  height: 3px;
  background-color: var(--foam);
  border-radius: 1px;
}

.brand__mark i:nth-child(1) { top: 1px; width: 12px; opacity: 0.95; }
.brand__mark i:nth-child(2) { top: 9px; width: 9px; opacity: 0.62; }
.brand__mark i:nth-child(3) { top: 17px; width: 6px; opacity: 0.34; }

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--foam);
  white-space: nowrap;
  transition: font-size 0.32s var(--ease);
}

.site-header[data-stuck] .brand__name { font-size: 17px; }

.brand__status {
  font-family: var(--font-num);
  font-size: 11px;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--mist-400);
  white-space: nowrap;
}

/* 桌面导航 */
.nav { margin-left: auto; }

.nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav__link {
  position: relative;
  display: block;
  padding: 9px 13px;
  font-size: 15px;
  line-height: 1.2;
  color: rgba(242, 246, 248, 0.74);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 1px;
  height: 2px;
  background-color: var(--lava-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease), background-color 0.28s var(--ease);
}

.nav__link:hover { color: var(--foam); }
.nav__link:hover::after { transform: scaleX(1); }

.nav__link[aria-current="page"] { color: var(--foam); }

.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--tide-400);
}

.site-header__cta {
  flex: none;
  padding: 11px 18px;
  font-size: 14px;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 10px 14px;
  border: 1px solid var(--glass-line);
  border-radius: 2px;
  background-color: var(--glass);
  color: var(--foam);
  font-size: 14px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--tide-400);
  background-color: rgba(47, 211, 192, 0.1);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background-color: var(--foam);
  border-radius: 1px;
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.nav-toggle__bars i:nth-child(2) { width: 74%; }

.site-header[data-open="true"] .nav-toggle__bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }

.site-header[data-open="true"] .nav-toggle__bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 移动端抽屉 */
.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 6px var(--pad) 26px;
  background-color: var(--sea-900);
  border-top: 1px solid var(--glass-line);
  max-height: calc(100vh - 64px);
  max-height: calc(100dvh - 64px);
  overflow-y: auto;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
}

.mobile-nav__link {
  display: block;
  padding: 15px 2px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--foam);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 163, 178, 0.16);
}

.mobile-nav__link:hover { color: var(--lava-300); }

.mobile-nav__link[aria-current="page"] { color: var(--tide-400); }

.mobile-nav__cta {
  margin-top: 22px;
  justify-content: center;
}

.mobile-nav__meta {
  margin-top: 14px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist-400);
}

@media (max-width: 1100px) {
  .nav__link { padding: 9px 10px; font-size: 14px; }
  .nav__link::after { left: 10px; right: 10px; }
}

@media (max-width: 960px) {
  .site-header__inner { min-height: 72px; gap: 16px; }
  .site-header[data-stuck] .site-header__inner { min-height: 62px; }
  .nav { display: none; }
  .site-header__cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .brand__status { display: none; }
  .site-header[data-open="true"] .mobile-nav { display: flex; }
}

@media (max-width: 380px) {
  .nav-toggle__text { display: none; }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  background-color: var(--sea-900);
  border-top: 1px solid var(--glass-line);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--tide-400), var(--palm-500) 42%, var(--lava-500) 100%);
  opacity: 0.55;
  transform: skewY(-0.35deg);
  transform-origin: left center;
}

.site-footer__inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 68px var(--pad) 0;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px 32px;
}

.site-footer__brand .brand { margin-bottom: 16px; }

.site-footer__note {
  max-width: 24ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-400);
}

.site-footer__title {
  margin-bottom: 16px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--mist-400);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__list a {
  font-size: 15px;
  color: rgba(242, 246, 248, 0.8);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.site-footer__list a:hover { color: var(--lava-300); }

.site-footer__contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px 32px;
  margin-top: 52px;
  padding: 24px 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.site-footer__contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  font-size: 14px;
  max-width: none;
}

.site-footer__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist-400);
}

.site-footer__value {
  color: var(--foam);
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.site-footer__note-line {
  grid-column: 1 / -1;
  max-width: 70ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-400);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 28px;
  padding: 26px 0 34px;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.site-footer__legal a {
  font-size: 13px;
  color: var(--mist-400);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.site-footer__legal a:hover { color: var(--foam); }

.site-footer__copy,
.site-footer__icp {
  max-width: none;
  font-size: 13px;
  color: var(--mist-400);
}

.site-footer__copy { font-family: var(--font-num); font-variant-numeric: tabular-nums; }

/* 联赛滚动条 */
.ticker {
  overflow: hidden;
  padding: 10px 0;
  border-top: 1px solid var(--hairline);
  background-image: linear-gradient(
    90deg,
    rgba(47, 211, 192, 0.1),
    rgba(63, 191, 127, 0.05) 50%,
    rgba(255, 106, 43, 0.1)
  );
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}

.ticker__track {
  display: flex;
  width: max-content;
  animation: ticker-run 46s linear infinite;
}

.ticker__item {
  padding-right: 44px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-400);
  white-space: nowrap;
}

.ticker__item b {
  color: var(--amber);
  font-weight: 600;
}

@keyframes ticker-run {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@media (min-width: 768px) {
  .site-footer__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .site-footer__brand { grid-column: 1 / -1; }
  .site-footer__contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .site-footer__inner { padding-top: 80px; }
  .site-footer__grid {
    grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr));
    gap: 48px 32px;
  }
  .site-footer__brand { grid-column: auto; }
  .site-footer__contact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ============================================================
   滚动显现协议
   ============================================================ */
[data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity 0.48s var(--ease), transform 0.48s var(--ease);
}

html.js-reveal [data-reveal]:not(.is-in) {
  opacity: 0;
  transform: translateY(18px);
}

/* ============================================================
   降级：reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
    scroll-padding-top: 72px;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal],
  html.js-reveal [data-reveal]:not(.is-in) {
    opacity: 1 !important;
    transform: none !important;
  }

  .ticker__track {
    animation: none !important;
    padding-left: var(--pad);
  }

  .nav__link::after { transition: none; }
}